Question about 1999 Pontiac Sunfire

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No heat The blower motor is broken

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  • bridgetmccur
    bridgetmccur Feb 16, 2012

    Thanks Calvin, because the motor/fan was only $35 I went ahead and replaced it. It doesn't blow strong, but it does blow now, but still no heat. I have also replaced the relay? Square thing, fits in fuse container under hood.

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  • 183 Answers

Try the fan speed switch, on your dash where you turn it on, usually it's the connector for that switch has been my experience.

Posted on Feb 16, 2012

  • Calvin Hart
    Calvin Hart Feb 18, 2012

    If the air is blowing, and isn't hot, you have one of 3 problems, listed easiest to hardest to fix. 1 Low coolant level, or air in the engine side of the cooling system, bad or no thermostat, and leaking or clogged heater core. One way to solve them all is buy a thermostat and a gallon of straight antifreeze, remove old thermostat and lower coolant hose, put a garden hose where the thermostat goes, turn it on as strong as you can get it and the hose stay in the engine and not spray everywhere, untill the water that comes out the bottom of the engine is clean and unrestricted, replace hoses and thermostat fill system, warm up the engine with radiator cap off, and check often. Two things to remember, look in the passenger floorboard of the car for water, this is a sign of a leaking heater core, you see water in the floor, gotta replace the heater core. And 2. be careful not to soak any major elecrical components in the process, Alternator and ECM mainly. The ECM is on the wheel well, cover it with a plastic bag if you want. Other than that, it should fix it. Enjoy the heat.

  • Calvin Hart
    Calvin Hart Feb 18, 2012

    And if it's not blowing very well after replacing the blower motor, I still think you need to check the connection to the fan switch on the dash, these connectors burn up all the time in pontiac compacts, and GM Trucks. All it takes is a phillips screwdriver or a little ratchet 1\4 or so, and a bit of time.

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